Why do I have no attachments with Invisalign? (photos)

I am on tray 2/30 of Invisalign. I am meeting the ortho again for a check up on progress at the end of tray 4. Why have I got no attachments?

I am on tray 2/30 of Invisalign. I am meeting the ortho again for a check up on progress at the end of tray 4. Why have I got no attachments?
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